PDF malware analysis — malicious · 63e456fee1e74bd3

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 23:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 38c09b5d7c5ae7ffdaf8b7620117a82a SHA-1: b68cbd1e0cc40721a0cd2bfba0d363bfca37bd5a SHA-256: 63e456fee1e74bd37bba117686d4a7a71935e743e458480d7a35675e672e0532

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the PDF structure itself are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://smidgel.ru/uplcv?utm_term=life+is+strange+full+episode+apk PDF link annotation
- https://stoneappeal.in/FCKeditor/file/dufomikerunilosog.pdfIn PDF document text
- https://francoisdaulte.com/ckfinder/userfiles/files/7111050989.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ki6dqqas7uesi64vluq4m75g10/donikekupefogajuze.pdfIn PDF document text
- http://konferencii.org/web/uploads/assets/file/18607016994.pdfIn PDF document text
- http://vinhthuanvietnam.com/upload/files/32116437151.pdfIn PDF document text
- https://glaskunstcentrum.nl/images/file/pituramazudize.pdfIn PDF document text
- http://nawoo.net/userData/board/file/pexelo.pdfIn PDF document text
- http://sostrevalli.it/userfiles/files/6499749900.pdfIn PDF document text
- http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385d4cbdc2f---46967043390.pdfIn PDF document text
- https://toananhmedical.com/uploads/files/27710123561.pdfIn PDF document text
- http://kcpsystem.com/userData/board/file/21824788165.pdfIn PDF document text
- https://bomberosdenavarra.com/userfiles_nexo/files/lopepapi.pdfIn PDF document text
- http://boonfagrandhome.com/user_img/files/86914521413.pdfIn PDF document text
- https://tskrea.com/userfiles/file/61803712479.pdfIn PDF document text
- https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/425539ba3372c44e4f341751704d6178/magiguvudu.pdfIn PDF document text
- http://ventss.ru/userfiles/files/47535541303.pdfIn PDF document text
- http://firesecurity.sk/userfiles/file/44422641118.pdfIn PDF document text
- https://dovolena-jiznicechy.cz/uploads/49662534548.pdfIn PDF document text
- http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161320bd753e74---84628697463.pdfIn PDF document text
- http://walosports.cl/userfiles/file/27638113141.pdfIn PDF document text
- https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/gukulixadisutanirugunob.pdfIn PDF document text
- http://myucmas.com/userfiles/file/39506424782.pdfIn PDF document text
- https://speedwayinfo.hu/uploads/file/kedanivuzuzexijorexaja.pdfIn PDF document text
- http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132674eafd5e---firilokelorumedu.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c373.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC373	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000db8a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB8A	10824 bytes
SHA-256: `04dec76a2aca6e0d30b75b7df81cba03583e3eb8a13793e64440950ad2ea18d7`
`font_02_sfnt_off0000f46d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF46D	17108 bytes
SHA-256: `4dbac4425d4aefe6105327db29a98bbda6c0867c91b90295c3576598bdb7cdbe`

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